The agricultural areas of the world face problems that create difficulties when producing food and the excessive use of fertilizers is generating a negative environmental impact. An alternative that appears as a solution to this problem is the use of nanofertilizers. Within nanofertilizers an area of opportunity is the application of macronutrients, which report an increase in absorption efficiency of 19% compared to conventional fertilizers. Potassium (K) is one of the three macronutrients most used in agriculture and its deficiency affects key processes in plant development, limiting crop production. However, the number of publications where K is used as a nanofertilizer is limited, despite this, products in this form are already on the market. Therefore, the aim of this research work was to study the effect of the foliar application of K nanofertilizer on biomass, yield, nitrogen assimilation and photosynthetic activity in green beans cv. ‘Strike’. K was applied in the form of a nanofertilizer in doses of 0, 50, 100 and 200 ppm. The biomass accumulation, yield, nitrate reductase enzyme activity, photosynthetic activity and photosynthetic pigments were evaluated. The dose of 100 ppm of K nanofertilizer obtained a higher accumulation of biomass, nitrate reductase activity, photosynthetic activity, SPAD values and total chlorophyll content. While the 200-ppm dose obtained a higher increase in yield. The results obtained suggest that the application of K nanofertilizers benefits the physiological development of plants. However, more studies are required to compare the application of nanofertilizers with traditional fertilizers.

Boron (B) nanofertilizers are an innovative alternative with great potential to make nutrient application more efficient and thereby improve crop growth and productivity. However, nowadays there is little literature on the effects of boron nanofertilizers on physiological and biochemical processes in plants. Therefore, the objective of the present research was to study the efficacy of foliar application of a boron nanofertilizer on biomass, yield, nitrogen assimilation and photosynthetic activity in green beans plants cv. Strike. The B nanofertilizer was foliar applied at 0, 25, 50 and 100 ppm. Biomass accumulation, yield, nitrate reductase enzyme activity, photosynthetic activity, stomatal conductance and photosynthetic pigment content were evaluated. The results obtained indicate that the application of B nanofertilizer at dose of 25 ppm were more effective in improving biomass, while the dose of 100 ppm favoured nitrate reductase activity and stomatal conductance. The results suggest that the application of B nanofertilizers stimulated the development of green bean plants. Finally, more studies are needed to evaluate the possible phytotoxic effects of high doses of B nanofertilizers and to compare their effects with conventional B fertilizers already used in the market.

ME (2020) Diagnóstico y evaluación del uso y aprovechamiento del agua en el Dis

The use of biostimulants, such as salicylic acid (SA) and chitosan, are a sustainable strategy to solve stress problems in plants. Its use has been shown to have synergy with metallic microelements, which are very important for the development of crops under stress situations. An advance in the application of these nutrients is the use of nanoparticles, which emerge as a more precise alternative to achieve optimal plant development. The objective of this study was to evaluate the effect of foliar application of biostimulants, iron (Fe) and zinc (Zn) nanoparticles on growth, nitrogen assimilation, and nutritional content in green bean cv. ‘Strike’. Three treatments were used where complete nutrient solution was applied via foliar, the combination of chitosan (Q) plus SA and nanoparticles of Fe and Zn plus Q and SA. The application of nutrient solution favoured biomass content and carotene content. While the Q+SA treatment increased the nitrate reductase enzymatic activity, the mineral content in the root and the amino acid content, which places it as a viable alternative in situations where the supply of nutrients is limited or the plant cope with stressful situations. For its part, the application of nanoparticles of Fe and Zn plus biostimulants generated an increase in the mineral content of the aerial part, indicating that the application of this type of compound generates a greater mobility of nutrients within the plant.